Door phone



Dec. 28 1926. 1,612184 R. B. FRISBEY DOOR PHONE Filed Deo. 24, 1924 7 5 P/G.y

Patented Dec. 28, 1926.

RUSSELL BENJAMN F-RISBEY, CF O fiKLi-ND, CALIFORNIA.

DOOR PHONE.

Application ledjecember 24, 1924. Serial No. 757,855.

idy invention relates to a door phone of the speaking tube type, the purpose being 'to allow person to readily speak to a listener through door panel or traine, but that neither' party can see he door phone. An objectot my non to provide a short speaking tube, which may be readily inserted in a hole bored in a panel or fra-Ine of a door adjacent theY edge or in a cross bar at a convenient height to speak and listen through.

ln my speciio constructions a circular hole is bored through a door and the door phone, @insisting of plates clamped at Aeach side olf is secured in the hole or aperture.

lhis niay be by a bolt type oi construction or by threaded sleeves, the plates having` apertures or sinall size to convey the sound et a person speaking. My door phone may be attached to an outside door of a house and cannot readily be reinoved by a person on the outside, and allows a person on the inside to ascertain who is outside before opening,` the door. In one type of oonstruotion a person on the inside can regulate the apertures in the plates so that they may see outside.

My invention will be inore readily understood 'troni the following specification and drawings in Whiohz*- Figure l is a trent inside elevation ol" the door phone, with the door omitted.

Figure 2 's a vertical section o figure l on the line 2 2, illustrating the attachmentto a door.

lli@ is a vertical section olf Figure fl on the line --3, illustrating a niodilieation.

Figure is an elevation ot the door phone of Figure 3 in the direction ot the arr if viewing the inside.

In the construction shown in Figures l and 2, the door is designated by the nuineral l and may be of any desired type, either of wood or nietal; and has a bored hole or a1 erture therethrough. Combined mouth and ear plates 3 and 4C are situated on opposite sides 5 ot the door and have apertures 6 and .7 therethrough. 0n one ol these plates, indicated as 3, l rigidly secure a rod or sleeve 8, which is shown as, held by a riveted end 9 on the outside of a central perforation l0 in the plate. The plate l has a central perforation ll through which a screw l2 may be inserted, said screw having a threaded engagement 13 with the rod or sleeve 8. In this manner the outside n niouth and ear plates may be tightly olainped together and will grip the opposite sides 5 of the door. ln this man ier Athese plates are clamped tight to the door and are held in proper adjusted position with respect to other.

ln order to prevent a person looking` through the apertures 6 i'orln baliles to prevent ora'l't frein blowing through :the door phone, I inount one or more baille plates le ofsiinilar construction on the rod or sleeve 8. These are shown secured in position by ln the Construction shown in 'Figures 3 and Ll, the mouth and ear plates 20 and ero soirewhat cone-shaped to forni inouth curved bead Qro and ne edge 27 ot the plate into a screw- Ql may be turned n the surface oi' 'the door in tightening the plates in position.

Each plate has an annular groove 2S in which is secured a disk 29 in the outsioe plate 20, and a dish in the inside plate. 2l, these being' pressed in place betere the door phone is assembled in the door. The dish l0 supports a central stud 3l on which is niou'etel an oecillatable disl 32, which is re i )vement indentaon t engag able C". short o. nee, by the linger grips 3o, sheen Curved to lit the plate 'llie dislrs 29 und S30 have a series et porforations 35, to allouv sound to pass, and the osoillatuble dish 32 has a series ot similar pertorations 3i', which may be brought into re "stration with the perliorations ot the in e dish The manner or' assembling and usingl the door phone ot ligures ,il and t is as tollows:-The plates 20 and 2l, with the disks 29 and 30 in place, are Connected, lroni opposite sides oil? a door by screwing them into the sleeve The disk is normally positioned with its peri'oiiations 87 out of ro? ter with the perforations or the iiil d disk 30. By means ot the linger grips 355 the pertorations may be brought into regis andiv and also to i" Y having thel perfora- 4tions l5 fitting tight on the irod 8,

have threaded neelrs and 23,

lll)

ter; and the position and size of the perforations may be such that a person may readily look out to see who is outside.

Claimsl. A door phone comprising in combination a pair of cone-shaped mouth and ear plates, a screw threaded connection for said plates and perforated dises held in the plates.

2. A door phone having a pair of fixed mouth and ear plates, means for holding the plates in an opening in a door, and a movable plate having apertures adapted to register with those oit one of the mouth and f plates.

ture in a door, a sleeve positioned between and engaging said mouthpieees to hold them together, and a pair oi' perforated dises seated in said mouthpieces and adapted to serve as combined mouth plates and ear plates.

A door phone as specified in claim l wherein one of the mouthpieoes is provided at its outer edge with teeth adapted to engage the surface of the door.

6. A device of the class described, comprising a pair of mouthpieces shaped to seat in a suitable aperturee each ot saidl mout-lipieees being provided with an annular groove on its inner suriaee and a rolled edge adapted to engage the rimot said aperture, a perforated dise seated in each of said annular grooves, a movable perforated dislr mounted on one of the lined disks, and a sleeve positioned between and engaging with said mouthpieces to hold them in position after the device has been installed.

In testimony whereof aiiX my sinature.

RUSSELL BENJAMIN riarssnr. 

